The investigators recently proposed a new hypothesis on the pathogenesis of mammillary fistulae (MF) suggesting that occlusion of hair follicles by keratinous plugging may relevantly contribute to the development of MF. The investigators believe that the pathogenesis of MF mimics the behaviour of hidradenitis suppurative, as both clinical entities manifest themselves as a chronic, suppurative and recurrent inflammatory process. This new proposal has led to the present suggestion of a therapeutic alternative for MF.